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Preparation of Amides

Preparation of Amides

Amides are synthesized by treating carboxylic acids with amines in the presence of dehydrating agents like dicyclohexylcarbodiimide (DCC).
The DCC-promoted synthesis of amides begins with the protonation of DCC by carboxylic acid. The protonation makes it a better acceptor. Next, the addition of carboxylate to the protonated carbodiimide gives a reactive acylating agent.
Subsequently, the amine acts as a nucleophile that attacks the acylating agent to form a tetrahedral intermediate. In the...

Preparation of 1° Amines: Gabriel Synthesis

Preparation of 1° Amines: Gabriel Synthesis

Direct alkylation is not a suitable method for synthesizing amines because it produces polyalkylated products. Gabriel synthesis is the most preferred method to exclusively make primary amines. The method uses phthalimide, which contains a protected form of nitrogen that participates in alkylation only once to predominantly give primary amines.
Strong bases like NaOH or KOH deprotonate the phthalimide to form the corresponding anion, which acts as a nucleophile. Further, the anion attacks an...

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Split-and-pool Synthesis and Characterization of Peptide Tertiary Amide Library

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Published on: June 20, 2014

Solid-phase synthesis of a thymidinyl dipeptide urea library.

Dianqing Sun¹, Richard E Lee

¹Department of Pharmaceutical Sciences, University of Tennessee Health Science Center, Memphis, Tennessee 38163, USA.

Journal of Combinatorial Chemistry

|April 10, 2007

Summary

Researchers developed a novel solid-phase synthesis for thymidinyl dipeptide ureas, a class of compounds similar to nucleoside peptide antibiotics. This method efficiently produced a large library with good yield and purity.

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Area of Science:

Medicinal Chemistry
Organic Synthesis
Drug Discovery

Background:

Nucleoside peptide antibiotics are a vital class of therapeutic agents.
Developing novel synthetic routes for complex molecules is crucial for drug discovery.
Thymidinyl dipeptide ureas represent a promising structural motif for new antibiotics.

Purpose of the Study:

To design and synthesize a library of thymidinyl dipeptide ureas.
To develop and optimize a solid-phase synthesis strategy for this library.
To establish a scalable and efficient method for producing these compounds.

Main Methods:

Solid-phase synthesis initiated from 5'-azidothymidine on a polystyrene butyl diethylsilane (PS-DES) resin.
Optimization of maximum loading capacity and orthogonal functionalized side-chain protection.
Development of a 64-member test library and optimization of the final cleavage step.
Utilized IRORI-directed sorting technology in MiniKans for library generation.

Main Results:

Successfully optimized solid-phase synthesis procedures.
Developed a robust method for synthesizing thymidinyl dipeptide ureas.
Produced a 1000-member library in 50 micromol quantities.
Achieved good yields and high purity for the synthesized library.

Conclusions:

The developed solid-phase synthesis is effective for generating thymidinyl dipeptide urea libraries.
This methodology enables the efficient production of diverse compound libraries for drug screening.
The study provides a foundation for further exploration of nucleoside peptide analogs as potential antibiotics.